Try to change appearence of some tags via css

Custom CSS & Theme Design
2

The post here from efemkay is a good summary of styling tags in the editor:

Styling individual tags is a chore, but you can probably get away with adding:

.cm-tag-ListedTag1 {
    color: green;
    background-color: blue;
}

.cm-tag-ListedTag2 {
    color: yellow;
    background-color: blue;
}

...

to what you have now for your use case.